ifdef NoNanoHTTPD
static virtual NanoHTTPD.Response noCacheHeaders(virtual NanoHTTPD.Response r) {
  ret subBot_noCacheHeaders(r);
}
endifdef

ifndef NoNanoHTTPD
static NanoHTTPD.Response noCacheHeaders(NanoHTTPD.Response r) {
  r.addHeader("Cache-Control", "no-cache, must-revalidate, max-age=0");
  ret r;
}
endifndef